Well as said rare to a point ,,,should not have happened at all all. All oil changes synthetic whole nine yards and not towed at all just daily commute ,but it is the rear one that failed in the heat area .Turbo and converter replacement required,,,,however good news is My dealer went to bat for me ,I asked them to ask for 50%figuring better to ask for the expectation rather than leaving it on the table. Ford did better , gonna cost me a 500.00 gotta be happy with that thank you guys